Error Code 800B0100 and 800706BE updating Microsoft .NET Framework 3.5 Service Pack 1 and upgrade to Service Pack 2.

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Based on the information, Microsoft .NET Framework 3.5 Service Pack 1 and Vista Service Pack (SP) 2 installation fails with error code: 800B0100 and 800706BE.

It would be helpful if you could reply to the question to assist you better.

Did you try to install the updates manually?

Let’s try the following steps and check if it helps.

Regarding the .Net framework installation error code, you may try the steps provided in the article and check if it helps.

Error codes “0x80070643” or “0x643” occur when you install the .NET Framework updates

Note: The above mentioned article contains steps to disable third party services. After you have finished the troubleshooting, try the steps provided in the section “How to reset the computer to start as usual after troubleshooting with clean boot” to boot in normal startup

You may also refer to the article and check if it helps.

Windows Update Error 800B0100

Regarding the Service Pack 1 installation, you may try the steps provided in the articles and check if it helps.

How to troubleshoot Windows Vista and Windows Server 2008 service pack installation issues

Note: The above mentioned article contains steps to uninstall security software. Once you have finished the troubleshooting install the same.

For further information, refer to the article:

Learn how to install Windows Vista Service Pack 2 (SP2)  

Hope the information helps.

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